Improvement in steam-pumps



UNITED STATES WALES ALDRICH, OF DAYTON, OHIO.

IMPROVEMENT IN STEAM-PUMPS Specification forming part of Letters Patent No.

139,103, dated May 20, 1873 application filed March 22, 1873.

To all whom it may concern:

Be it known that I, WALES ALDRICH, of Dayton, in the county of Montgomery and State of Ohio, have invented a new and valuable Improvement in Steam-Pumps; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawing making a part of this specification, and to the letters and figures of reference marked thereon.

Figure 1 of the drawing is a representation of a longitudinal section of my invention. Fig. 2 is a cross-section of the same. Fig. 3 is a detail view. 7

This invention has relation to a cut-off for steam-pumps and-steam-engines; and it consists in the construction and novel arrangement of a spring or weighted lever for changing the motion of the auxiliary valve, in connection with the main valve and valve-rod, the stops, and steam-ports.

In the accompanying drawing, the letter A indicates the pump; B, the piston-cylinder, connected therewith by the frame 0. D represents the valve-chest, supplied with steam through the pipe at. E indicates the main valve, connected with which is the valve-rod I), having the stops 0 c, which engage with the check-standard F. G represents the auxiliary valve, provided on its back with a rack, c, with which a segment-pinion, 4;, having its chord uppermost, engages. A spring, z, secured to the valve-chest, presses upon the chord of the segment-pinion in such a manner as to tend to keep it in a central or balanced position with reference to the rack; or a weighted arm, a, may be secured to the axis of the pinion, with the same object in view. The exhaust is indicated at m, and the steam-ports at n.

The operation is as follows: The piston being at the further end of the cylinder, steam is admitted, through the passage to of the main valve, to the steam-port. As the piston commences to traverse the cylinder back to its starting-point, the auxiliary valve is relieved from the pressure of the stop 0 of the main valve-rod, and is forced by the spring z, in connection with the rack and segment-pinion, backward to its central or balanced position, connecting the passage a of the main valve with the exhaust. The valves remain in this relative position until the piston reaches the end of its course, when the stop 0 throws the main valve, opening the opposite steamport, to be closed by the auxiliary valve, under the action of the balance-spring, so soon as the valve-rod is released from the stop.

What I claim as new, and desire to secure by Letters Patent, is

The combination, witlrthe auxiliary valve G, main valve E, valve-rod, andstop-connections, of the rack e, pinion 'u, and balancespring 2, substantially as specified.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

WALES ALDRICH. Witnesses:

SAML. B. SMITH, J OSEPH CLEGG. 

